Is my tranny or differential broke? Options

[HardHead93]

The car has been leaking gear oil. I thought it was an axle seal so I took it to my local shop because they installed the original seal and would warranty it. Come to find out it is not the seal. The axle has some serious in and out play in it. When it moves out gear oil leaks out. The shop has tried 2 other brand new axles and the problem is the same. The last axle would not click and lock in. I have a helical LSD in an S54 transmission and I am running a Gen 4 3sgte tuned for 340 hp on E85. I track the car so it gets beat on pretty hard. The shop is having a hard time getting a good part number because the original part number is discontinued but superseded by another. One axle came from OReilly's and the other came from AutoZone. Is the tranny or the differential broke or am I not getting the right axle? Has anyone else had this problem?

[HardHead93]

Bad news! The S51 tranny I got has broken hooks for the shifter cables.
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I can't believe I missed that when I picked it up. I call the salvage yard and they are willing to exchange it. It just sucks because I have to go back to El Paso, TX (1 hour each way) to get to the yard. I also pulled the S54 tranny from the car. It was not too bad, it only took 3 hours. It will probably take longer to put back in (taking apart is faster than putting it back together). I have the engine on a hanger inside the bay because only 1 of the 4 motor mounts stays attached when pulling the tranny.
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Here is my old clutch. It is a SPEC Stage 2 disk with an Exedy pressure plate. It held 340 hp to the wheels fine on e85. I also have a lightweight flywheel with this setup.
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This post has been edited by HardHead93: May 3, 2019 - 9:09 PM